Frymaster 47 SERIES Installation, Operation, Service, And Parts Manual page 77

Another cause of popping is an insufficient air
supply or drafts that are blowing the pilot
flame away from the burner. Check for "nega-
tive pressure" conditions in the kitchen area.
If air is flowing into the kitchen area, this in-
dicates that more air is being exhausted than is
being replenished and the burners may be
starved for air.
If the fryer's gas and air supplies are okay, the
problem most likely is with one of the electri-
cal components. Examine the ignition module
for signs of melting/distortion and/or discol-
oration due to excessive heat build-up in the
fryer. (This condition usually indicates im-
proper flue performance.). Also, examine the
controller for the same conditions. A melted
or distorted ignition module is automatically
suspect and should be replaced, but unless the
condition causing excessive heat in the fryer is
corrected, the problem is likely to recur.
Next, check to ensure the ignition wire is
tightly connected at both ends and examine it
for obvious signs of damage. Again, if dam-
age is due to excessive heat in the fryer, that
problem must also be corrected.
Check for proper operation by disconnecting
the wire from the igniter (spark plug), insert-
ing the tip of a screw driver into the terminal,
and holding it near the frame of the fryer as
the power switch is placed in the ON position.
A strong, blue spark should be generated for at
least 4 seconds.
DANGER
MAKE SURE YOU ARE HOLDING THE
INSULATED HANDLE OF THE
SCREWDRIVER AND NOT THE BLADE.
THE SPARKING CHARGE IS
APPROXIMATELY 25,000 VOLTS.
47 SERIES GAS FRYERS
CHAPTER 7: SERVICE PROCEDURES
7-18
Examine the igniter (spark plug) for any signs
of cracking. A cracked igniter must be re-
placed.
The burner lighting on one side only may be
caused by a missing or misaligned rear de-
flector target or improper burner manifold
pressure. Clogged burner orifices are usually
the cause of gaps in burner firing.
Fluctuating flame intensity is normally
caused by either improper or fluctuating in-
coming gas pressure, but may also be the re-
sult of variations in the kitchen atmosphere.
Verify incoming gas pressure in the same way
as for "popping," discussed in the preceding
paragraphs. Variations in the kitchen atmos-
phere are usually caused by air conditioning
and/or ventilation units starting and stopping
during the day. As they start and stop, the
pressure in the kitchen may change from posi-
tive or neutral to negative, or vice versa. They
may also cause changes in airflow patterns
that may affect flame intensity.
Flames "rolling" out of the fryer are usually
an indication of negative pressure in the
kitchen. Air is being sucked out of the fryer
enclosure and the flames are literally follow-
ing the air. If negative pressure is not the
cause, check for high burner manifold gas
pressure in accordance with the procedures in
Chapter 5. An obstructed flue, which prevents
the fryer from properly exhausting, may also
be the cause.
An excessively noisy burner, especially with
flames visible above the flue opening, may
indicate that the burner gas pressure is too
high, or it may simply be that the gas valve
vent tube is blocked. If the gas pressure is
correct and the vent tube in unobstructed, the
gas valve regulator is probably defective.